Vow of New Light For 'Dark' Trades

WASHINGTON—A top U.S. regulator plans to shine a light on dark pools, private trading venues that allow buyers and sellers to post orders that are hidden from the rest of the market.

Richard Ketchum, chief executive of the Financial Industry Regulatory Authority, said in an interview Tuesday that the regulator is expanding its oversight of the dark-trading venues, with an eye on whether orders placed in public exchanges are...